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ree air. If this simple approach is not feasible there arealternative methods to remove unwanted ethylene. However, it is not certain with any of 4 DeEll et al. these methods that the ethylene concentration is constantly kept low enough to avoid induction of ethylene-based responses. The majority of the commercially available meth-ods use one or more of the following processes (1,. Potassium permanganate (KMnO oxidizes ethylene to CO 2and 2O. It is usually available commercially impregnated into porous material that may also have some eth- ylene absorbing properties. Ethylene can be oxidized by ultraviolet (UV) lamps or ozone ( generators (9,. Although 3gas oxidizes ethylene, it is possible that some of the ethylene is directly oxidized by the UV radiation or the electric corona used in someO 3generators. Ethylene is also oxidized if it is heated in the presence of catalyst, such as platinized asbestos (9,. There are commercial units available that successfully circulate the cold air from storeroom, heat and oxidize the ethylene, and then remove the heat from the air before it is returned to the cold storeroom. Ethylene can be adsorbed on activated or brominated charcoal, but this method is not as successful commercially as the other mentioned methods. Hypobaric (low-pressure)storage was promoted in the 1s and 1s as storage method that could remove ethylene from the fruit. However, attempts to commercialize this technology have notbeen successful (9,1,. Another interesting removal method that has been proposed is the use of certain soil bacteria that use ethylene as biochemical substrate (1,. Two systems that remove 2from storage rooms, and may also remove ethylene, have been commercially available since the 1s (. One is the hollow ber technologyand the other is pressure swing adsorption (PSA). However, it has not been clearly demon-strated that the removal rate is sufcient to keep ethylene below 1 LL /H1in commercial storages. In 1, modic